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1
Content available remote Influence of water adsorption on mechanical properties of porous glasses.
100%
Rysiakiewicz-Pasek E.
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2000
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tom Vol. 30, nr 1
173-176
EN
An influence of different treatment of porous glass (water adsorption, heat or hexamethyldisilazane treatment) on the values of elasticity parameters was investigated. The laboratory ultrasonic tests were used to determine the dynamical elastic modulus. The observed changes of the dynamic elastic modulus of porous glasses were related with processes of adsorption and desorption of water from the pores.
2
Content available remote Li-ion conducting organic-inorganic hybrid electrolytes
51%
Żelazowska E. , Borczuch-Łączka M. , Rysiakiewicz-Pasek E. , Zduniewicz T.
Materials Science Poland
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2006
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tom Vol. 24, No. 1
133--140
EN
Lithium ion conducting, sol-gel derived, amorphous, organic-inorganic hybrid electrolytes were obtained from tetraethoxysilane, poly(ethylene oxide), propylene oxide, propylene carbonate, acetonitrile and LiClO4 precursors, and were investigated for their morphological and structural properties by scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD), infrared spectroscopy, and nitrogen adsorption at 77 K. A room-temperature conductivity of ca. 10-4-10-3 Sźcm-1, attributed to an amorphous character and the organic addition, as well as results of testing in WO3-based electrochromic thin-film systems, make the hybrid materials obtained promising as electrolytes for ambient temperature electrochemical and optoelectronic applications.
3
Content available remote Studies of the properties of copper-cadmium photochromic glasses.
51%
Rysiakiewicz-Pasek E. , Marczuk K. , Ziemba B.
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2000
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tom Vol. 30, nr 4
671-676
EN
The properties of photochromic glasses containing copper and cadmium chloride were investigated. The influence of the temperature and time of heat treatment on the change of the glass structure was considered. The parameters (coefficients) determining the bleaching process were calculated. To study the structure of photochromic glasses after heating the thermally stimulated depolarization technique was applied. The origin of TSDC peaks was discussed.
4
Content available remote Sol-gel derived Li-ion conducting polymer electrolytes
51%
Żelazowska E. , Rysiakiewicz-Pasek E. , Borczuch-Łączka M.
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tom Vol. 23, No. 1
177--194
EN
Organic-inorganic hybrids have recently become a remarkable family of amorphous polymer materials with promising potential applications. In the present study, sol-gel derived organic-inorganic hybrid electrolytes doped with lithium salts (LiCl, LiClO4) were produced from inorganic and organic precursors such as tetraethyl orthosilicate, poly(ethylene oxide), poly(ethylene glycol), propylene oxide, propylene carbonate, ethylene glycol, and 1,2-propylene glycol. The hybrid electrolytes were obtained in the form of flexible or glassy materials depending on the composition and heat treatment temperature (ranging from 80 to 125 ?C). The morphology, structure and elemental chemical composition of the electrolytes obtained were examined by scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM/EDS), FTIR spectroscopy, and X-ray diffraction (XRD). Infrared spectroscopy and SEM observation results indicate that the structural properties of the synthesized materials are significantly influenced by organic additives and the sol-gel preparation procedure. The formation of organic group-O-Si linkages was confirmed by infrared spectra in all of the electrolytes obtained. The results of FTIR analysis are in a good agreement with 13C and 1H MAS NMR spectroscopy measurements performed for the hydrolysed sols immediately before the gel transformation process and at early gel stages. These results have revealed an enhanced duration of the cross-linking process in the species prepared with low molecular mass glycols. Cells in an electrochromic window arrangement were prepared in order to observe the photometric and cyclic voltammetry characteristics of thin-film electrochromic systems with the investigated hybrid materials employed as electrolytes. The results indicate that the inorganic-organic hybrids synthesized in this work are promising electrolytes for thin film electrochromic systems based on WO3.
5
Content available remote Influence of gamma -irradiation on the photoluminescent properties of porous glasses.
45%
Gevelyuk S. A. , Lishchuk D. E. , Mak V. T. , Rysiakiewicz-Pasek E. , Marczuk K.
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2000
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tom Vol. 30, nr 4
595-603
EN
The influence of small doses of gamma -irradiation on the features of the photoluminescence spectra of porous silica glass during long-time (several months) storage after the irradiation is investigated. The non-monotonic dependence of photoluminescence change on the dose of the glasses with a different composition and different additional pre-treatment is observed. The analysis of intensity changes and shifts of the maxims of the photoluminescence spectra shows long-time oscillations. This indicates that the composite catalytic processes take place on the surface of the pores. Perhaps the small gamma -radiation doses initiate the cyclic process of the surface state transformation on the inner side of the pores.
6
Content available remote Small doses γ-irradiation effect on the photoluminescence properties of porous glasses
45%
Doycho I. K. , Gevelyuk S. A. , Kovalenko M. P. , Prokopovich L. P. , Rysiakiewicz-Pasek E.
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tom Vol. 33, nr 1
55-65
EN
The g-irradiation effect on the photoluminescence of various types of porous silica glasses and on its change during a half-year storage has been studied. It has been revealed that the photoluminescence intensity of glasses with fine matrix and almost complete absence of silica gel does not change when irradiated at applied doses, but a long-wave shift of its maximum position is observed. The increase in photoluminescence intensity appeared to be the most stable in glasses with the thick-wall matrix. The model which explains apparent changes in photo-luminescent properties and also allows us to draw conclusions about some features of various types of porous silicate glasses structure has been presented.
7
Content available remote Effect of antibiotic insertion on photoluminescent properties of silicate porous glasses used in ophthalmologic prostheses
45%
Rysiakiewicz-Pasek E. , Gevelyuk S. A. , Doycho I. K. , Prokopovich L. P. , Safronsky E. D.
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tom Vol. 33, nr 1
33-39
EN
The selection of silica porous glass being the most suitable material for manufacturing of the actuated scleral part of the eye prosthesis has been justified. The model explaining the photoluminescence intensity oscillations of porous glass during the effusion of the antibiotic out of the glass has been proposed. Multiple usage of the antibiotic has been found to lead to the etching effect of the porous glass and a method of minimization of the effect has been presented.
8
Content available remote Optical properties of nanoporous glass filled with TiO2 nanostructures
38%
Viter R. , Geveluk S. , Smyntyna V. , Doycho I. , Rysiakiewicz-Pasek E. , Buk J. , Kordas K.
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tom Vol. 42, nr 2
307-313
EN
Titanium dioxide nanoparticles (NP) and nanofibers (NF) were incorporated from polymeric gels into porous glasses. Two types of glasses A and B with different porosity were chosen for measurements. Optical absorbance and photoluminescence spectra of the samples were measured at the range of 200-1100 nm and 370-800 nm correspondently before and after TiO2 incorporation. The enhancement of TiO2 photoluminescence (PL) and short-wave shift of peaks for samples A and B was found. The obtained results are explained by quantum confinement effects.
9
Content available remote Linear extension of porous glasses with modified internal surface in humid environment.
38%
Gevelyuk S. A. , Doycho I. K. , Lishchuk D. E. , Prokopovich L. P. , Safronsky E. D. , Rysiakiewicz-Pasek E. , Roizin Y. O.
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2000
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tom Vol. 30, nr 4
605-611
EN
An original interferometric technique for investigating the influence of humidity on change in the linear dimensions of porous silica glasses is developed. The linear dimensions of a specimen are shown to change as a result of competition in the system of compressive capillary forces and expansion forces arising from the swelling of the residual silica gel present in pores. The possibility of selective inhibition of the capillary squeezing forces or the silica gel expansion forces by the pre-treatment of a porous material by a hydrophobized composition (hexamethyldisilazan - HMDS) or by annealing of carbon impregnated inside of the pores is shown experimentally.
10
Content available remote Carbon treatment as a method of the surface development of porous glasses
38%
Gevelyuk S. A. , Doycho I. K. , Kovalenko M. P. , Safronsky E. D. , Rysiakiewicz-Pasek E. , Roizin Y. O.
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2000
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tom Vol. 30, nr 4
635-640
EN
A method to develop the structure of the internal pore surface is proposed. The surface of porous silicate glasses is modified by impregnating carbon into the pores and subsequent annealing. The procedure is repeated several times. A technique to control the properties of the pore surface is proposed as well. Analysing the change in the features of the photoluminescence spectrum as a result of such treatment in comparison with the pore-size distribution spectra allows us to assume formation of silicon nanoclusters in porous glass and to estimate their sizes. The nonmonotonic change of the surface development with simultaneous stationary increase of photoluminescence intensity is explained by the composite pattern of the silicon clusters change during multiple carbon treatments.
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